So, yesterday I tried this shitty game after a long break. What I noticed is that in my case after every 10 seconds independent of where I am the players and projectiles and your mouse movement jitter (especially when jumping). I also notice that this occurs in specific areas. If I stay still the jittering continues and when I move 1 mm it stops :S As I already mentioned: this started maybe one year ago and I couldn't fix it with reinstalls, different configs (including no specific config), new operating system and new hard disk (TF 2 runs on an SSD), cleaning the registry and harddisks and what not. For your information: AMD Phenom-I-dunno 3,5 GHz, Radeon 5750, Windows 7, 8 GB RAM. I considered myself that it might be the graphics card which causes problems. But this crappy games always used to work untill one specific day...

Core parking shouldn't be an issue in terms of bottlenecking because if the priority for the program is high enough, the cores should be unparked when they are needed. Either you have the setting incorrectly configured or there is more to this than meets the eye. Honestly, nobody should have a reason to turn core parking off.

It's funny that this jittering stuff suddenly started around 1 or 2 years ago. Before that time TF 2 worked fine for me.

Would you regard jittering in certain places and times as fps freezing? Cause thats whats molesting me for several years and I couldnt fix it with reinstalls, new net settings, updates and so on.